Oxidation of gallium sulfides by Thiobacillus ferrooxidans

1978 ◽  
Vol 24 (7) ◽  
pp. 888-891 ◽  
Author(s):  
Arpad E. Torma
Keyword(s):  
Oxygen Uptake ◽  
Thiobacillus Ferrooxidans ◽  
Oxidation Process ◽  
Specific Rate ◽  
Bacterial Oxidation ◽  
Naturally Occurring ◽  
Bacterial Action ◽  
Chalcopyrite Concentrate

The bacterial oxidation of a naturally occurring gallium-bearing chalcopyrite concentrate and a pure synthetic gallium (III) sulfide has been investigated at pH 1.8 and 35 °C, using an active culture of Thiobacillus ferrooxidans. This oxidation process may proceed by direct or by indirect bacterial action. The highest dissolved gallium and copper concentrations were about 2.2 and 40.2 g/ℓ respectively. The order of the specific rate of oxygen uptake by T. ferrooxidans is approximately CuFeS2[Formula: see text] gallium-bearing CuFeS2 > FeS2 > CuS > Cu2S > Ga2S3.

Optimization of Bacterial Oxidation Process Parameters for Selective Leaching of Nickel by Thiobacillus Ferrooxidans

2006 ◽  
Vol 4 (1) ◽  
Author(s):  
Ravindra Pogaku ◽  
Bharathi Kodali
Keyword(s):  
Particle Size ◽  
Process Parameters ◽  
Thiobacillus Ferrooxidans ◽  
Oxidation Process ◽  
Inoculum Size ◽  
Pulp Density ◽  
Transfer Resistance ◽  
Bacterial Oxidation ◽  
Flotation Concentrate ◽  
Copper Flotation

Nickel bioleaching from copper flotation concentrate assumes greater significance because of its value and not many studies are carried out in these lines. Hence, nickel leaching was attempted and several process parameters of bacterial oxidation for copper flotation concentrate were examined for optimization. The parameters considered for shake flask leaching experiments were temperature, pulp density, particle size, agitation, residence time and inoculum size. The effect of variable proportions of each parameter on nickel leachability was studied. Optimum values of pulp density (10%) and agitation (140 rpm) played an important role in controlling the mass transfer resistance during leaching process. Increase in temperature from 27oC to 30oC has accelerated the bacterial oxidation process while initial concentration of inoculum (1-10%) has not shown considerable variation in nickel leachability. A particle size of ±60#size was found to be essential for bacterial attack. Maintenance of optimum conditions of leaching has yielded considerable nickel recovery (55%) compared to low recovery under unoptimal conditions.

Engineering aspects of a mixed methanotrophic culture in a membrane-aerated biofilm reactor

2004 ◽  
Vol 49 (11-12) ◽  
pp. 255-262 ◽  
Author(s):  
E. Casey ◽  
S. Rishell ◽  
B. Glennon ◽  
G. Hamer
Keyword(s):  
Oxygen Uptake ◽  
Biofilm Reactor ◽  
Specific Rate ◽  
Suspended Cell ◽  
Biofilm Thickness ◽  
Biofilm Reactors ◽  
Uptake Rates ◽  
Methane Uptake ◽  
Cell Processes ◽  
Oxidation Efficiency

Methanotrophic biodegradation using the membrane-aerated biofilm reactor (MABR) is a technology offering several advantages over both conventional biofilm reactors and suspended-cell processes. In this study the oxidation efficiency of a methanotrophic biofilm in a 1.5 litre MABR was investigated. Measurements of oxygen and methane uptake rates together with biofilm thickness were taken for developing biofilms. It was found that the specific rate of metabolic activity of the biofilm was unusually high as determined by the methane and oxygen uptake rates. Microbial activity stratification was evident and the location of stratified layers of oxygen consuming components of the consortium could be manipulated via the intra-membrane oxygen pressure.

Adaptation of Thiobacillus ferrooxidans to nickel ion and bacterial oxidation of nickel sulfide

1995 ◽  
Vol 17 (2) ◽  
pp. 229-232 ◽  
Author(s):  
Takami Kai} ◽  
Makoto Nishi ◽  
Takeshige Takahashi
Keyword(s):  
Nickel Sulfide ◽  
Thiobacillus Ferrooxidans ◽  
Nickel Ion ◽  
Bacterial Oxidation

scholarly journals Effects of Phospholipid on Bacterial Leaching of Chalcopyrite Concentrate by Thiobacillus ferrooxidans. Effects of phosphatidyglycerol.

1992 ◽  
Vol 108 (2) ◽  
pp. 129-133
Author(s):  
Naoki HIROYOSHI ◽  
Masami TSUNEKAWA ◽  
Tsuyoshi HIRAJIMA ◽  
Takakatsu TAKAMORI
Keyword(s):  
Thiobacillus Ferrooxidans ◽  
Bacterial Leaching ◽  
Chalcopyrite Concentrate

Oxidation of copper (II) selenide by Thiobacillus ferrooxidans

1972 ◽  
Vol 18 (11) ◽  
pp. 1780-1781 ◽  
Author(s):  
Arpad E. Torma ◽  
Fathi Habashi
Keyword(s):  
Thiobacillus Ferrooxidans ◽  
Oxidation Process ◽  
Copper Selenide ◽  
Elemental Selenium ◽  
Metabolic Oxidation

Thiobacillus ferrooxidans can derive its energy from the oxidation of copper selenide. In this metabolic oxidation process, copper goes into solution and elemental selenium is deposited.

ROLE OF THIOBACILLUS FERROOXIDANS IN THE OXIDATION OF SULFIDE MINERALS

1967 ◽  
Vol 13 (4) ◽  
pp. 397-403 ◽  
Author(s):  
D. W. Duncan ◽  
J. Landesman ◽  
C. C. Walden
Keyword(s):  
Oxygen Uptake ◽  
Sodium Azide ◽  
Ferrous Iron ◽  
Thiobacillus Ferrooxidans ◽  
Sulfide Oxidation ◽  
Iron Oxidation ◽  
Rapid Rate ◽  
Total Oxygen ◽  
Washed Cell

Selective inhibitors of iron and sulfide oxidation, sodium azide and N-ethylmaleimide respectively, were used to demonstrate that washed cell suspensions of Thiobacillus ferrooxidans attacked both insoluble ferrous iron and sulfide during the oxidation of chalcopyrite (CuFeS2) and pyrite (FeS2). The oxidation of the two substrates occurred simultaneously and independently but the relative rates depended on how the cells were grown. When chalcopyrite-grown cells were used to oxidize chalcopyrite, 68–74% of the oxygen uptake was the result of sulfide oxidation and 25–30% the result of iron oxidation. With pyrite, all the oxygen uptake was due to sulfide oxidation. When iron-grown cells were used to oxidize chalcopyrite, two rates resulted. During the initial rapid rate, 80–90% of the oxygen uptake was due to iron oxidation, but, during the second slower rate, the result duplicated those found with chalcopyrite-grown cells. Iron-grown cells oxidized pyrite at a constant and more rapid rate than chalcopyrite-grown cells. The faster rate was due to iron oxidation; since only 20–30% of the total oxygen uptake was due to sulfide oxidation.

scholarly journals Leaching behavior and its mechanism in the leaching of a chalcopyrite concentrate by Thiobacillus ferrooxidans.

1990 ◽  
Vol 106 (4) ◽  
pp. 173-179
Author(s):  
Takakatsu TAKAMORI ◽  
Keiko SASAKI ◽  
Masami TSUNEKAWA ◽  
Tsuyoshi HIRAJIMA
Keyword(s):  
Thiobacillus Ferrooxidans ◽  
Leaching Behavior ◽  
Chalcopyrite Concentrate
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